.12M File Type - Lotus 1-2-3 SmartMaster File
In Windows .12M File Open With
- Discontinued
Operating System (OS)
An operating system is the software that directly manages a system’s hardware and resources, like CPU, memory, and storage.
Windows
Windows also known as Microsoft Windows or Win is a graphical operating system developed and published by Microsoft. It provides a way to store files, run the software, connect to the Internet, and lots more.